![]() If the car is running low on transmission fluid, refill the reservoir to the proper level. Rattling noises when accelerating can be caused by low fluid levels in the A/T. Similar to the engine, the A/T will only run properly when filled with the right amount of transmission fluid. This solution is ideal for vehicles equipped with automatic transmissions. Read more about replacing knock sensors 2. When in doubt, it is still best to consult a professional mechanic. If you’re lucky a simple valve adjustment will suffice. In worst cases, the hydraulic lifters and valves will need to be replaced, resulting in a mild overhaul or top overhaul of the motor. Rattling sounds can also be caused by problems with the engine ECU or knock sensors in the engine. If the problem doesn’t go away, you should also check the ignition timing and the EGR valve of the motor. Using lower octane fuel will degrade engine performance and cause rattling sounds when accelerating. A car that requires 95 octane fuel should always be filled with the same type of gasoline. It is also a good idea to confirm you’re using the right fuel with the right octane level. ![]() Better yet, change the oil and see if the problem is eliminated. If you confirm the rattling noise is caused by the valve train (the valve train is located on the top of the motor), check the condition of the motor oil. It can also be caused by dirty oil and using the improper fuel octane required for your vehicle. ![]() Carbon rap is caused by premature ignition of the air and fuel mixture inside the motor. Some experts even call this rattling noise as ‘carbon rap’ and is caused by worn or sticking valves and hydraulic lifters. Issues with the valve train Img source: Edfooliuĭo you hear rattling noises similar to the sound of clinking bottles when accelerating the vehicle? The noise is caused by a sticky valve train. If you have an older car with a lot of miles on the odometer, rattling noises in the engine can be caused by the following problems: 1. Possible Causes of Engine Rattling Noises When Accelerating Windows not opening? You could have a bad regulator or power window motor. Step on the gas and accelerate slowly and wait for the rattling noise to occur. Find a nice and quiet place to drive to make the job easier. Open all the windows and turn off the radio. Take a friend with you as you drive, preferably someone who knows a thing or two about cars. Does it occur only when accelerating the vehicle? Or is the noise prevalent even during idling or cruising? Is the rattling noise coming from the front or rear? By determining the source of the rattling sound, it will be easier to diagnose the fault. The first step you need to take is to isolate the cause of the rattling noise. Sometimes rattling noises might require serious engine repair. Just a few months ago I found and annoying clunk on my Dodge Ram that was caused from the plastic wheel well bouncing against the frame because it wasn’t fully secured! In some cases the rattling noise might be caused by something mundane such as a loose heat shield in the exhaust manifold, or some other damage to the manifold. In all honesty, it can be tricky to diagnose such a problem unless you bring the car to a certified mechanic.īut there are things you can check under the hood to find that annoying rattling noise as you accelerate the vehicle. Rattling noises can either be a simple fix or an impending sign of a serious problem. Read more about the types of suspension systems.
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